An Efficient Solution Procedure For Elastohydrodynamic Contact Problems Considering Structural Dynamics
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An Efficient Solution Procedure For Elastohydrodynamic Contact Problems Considering Structural Dynamics
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Author : Schmidt, Jan Henrik
language : en
Publisher: KIT Scientific Publishing
Release Date : 2019-01-14
An Efficient Solution Procedure For Elastohydrodynamic Contact Problems Considering Structural Dynamics written by Schmidt, Jan Henrik and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-14 with categories.
An Efficient Solution Procedure For Elastohydrodynamic Contact Problems Considering Structural Dynamics
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Author : Jan Henrik Schmidt
language : en
Publisher:
Release Date : 2020-10-09
An Efficient Solution Procedure For Elastohydrodynamic Contact Problems Considering Structural Dynamics written by Jan Henrik Schmidt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-09 with Technology & Engineering categories.
This work presents an efficient solution procedure for the elastohydrodynamic (EHD) contact problem considering structural dynamics. The contact bodies are modeled using reduced finite element models. Singly diagonal implicit Runge-Kutta (SDIRK) methods are used for adaptive time integration. The structural model is coupled with the nonlinear Reynolds Equation using a monolithic coupling approach. Finally, a reduced order model of the complete nonlinear coupled problem is constructed. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
On The Influence Of Piecewise Defined Contact Geometries On Friction Dampers
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Author : Aramendiz Fuentes, Jimmy Alberto
language : en
Publisher: KIT Scientific Publishing
Release Date : 2023-09-12
On The Influence Of Piecewise Defined Contact Geometries On Friction Dampers written by Aramendiz Fuentes, Jimmy Alberto and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-12 with categories.
This work considers dampers that do not solely focus on a single strategy but instead combine them. The capabilities of conventional dry friction dampers are expanded by taking into account piecewise defined contact geometries. This leads to friction dampers that change their behavior depending on the amplitude of the oscillations. The vibration damping device in this work, introduces damping at high oscillation amplitudes and takes advantage of absorption at low oscillation amplitudes.
Dynamics Of Rotors On Refrigerant Lubricated Gas Foil Bearings
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Author : Leister, Tim
language : en
Publisher: KIT Scientific Publishing
Release Date : 2021-10-28
Dynamics Of Rotors On Refrigerant Lubricated Gas Foil Bearings written by Leister, Tim and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-28 with Technology & Engineering categories.
The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.
On Direct And Inverse Problems Related To Longitudinal Impact Of Non Uniform Elastic Rods
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Author : Burgert, Jens
language : en
Publisher: KIT Scientific Publishing
Release Date : 2021-05-07
On Direct And Inverse Problems Related To Longitudinal Impact Of Non Uniform Elastic Rods written by Burgert, Jens and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-07 with Technology & Engineering categories.
The impact of two non-uniform elastic rods is considered and a recursive method was developed that solves the inverse problem: Find the location-dependent impedance function of the impacting rod that generates a prescribed impact force. The developed method delivers exact solutions in closed-form. Moreover, a condition is derived which states if a physically meaningful solution exists. Finally, the underlying 1D model has been validated experimentally.
Thermomechanischer Kontakt Und Stochastische Dynamik Gleitender K Rper Mit Rauen Oberfl Chen
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Author : Oestringer, Lukas Julian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-06-28
Thermomechanischer Kontakt Und Stochastische Dynamik Gleitender K Rper Mit Rauen Oberfl Chen written by Oestringer, Lukas Julian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-28 with categories.
In dieser Arbeit wird der Reibwert für den trockenen Kontakt zweier gleitender metallischer Körper in Abhängigkeit verschiedener physikalischer Parameter berechnet. Dafür wird ein thermomechanisches Modell entwickelt und für verschiedene Kontaktkonfigurationen unter Berücksichtigung der Oberflächenrauigkeit beider Kontaktkörper ausgewertet. Darüber hinausgehende Untersuchungen zu den Auswirkungen des berechneten Reibwerts im Kontext von reibungserregten Schwingungen schließen sich an. - Within this work, the friction coefficient is calculated for the dry contact of two sliding metallic bodies as a function of various physical parameters. For this purpose, a thermomechanical model is developed and evaluated for different contact configurations considering the surface roughness of both contact bodies. Subsequent investigations on the consequences of the calculated friction coefficient in the context of friction-induced vibrations are carried out.
Ein Beitrag Zur Asymptotischen Analyse Der Hydraulischen Ventilsteuerungen
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Author : Schröders, Simon
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-09-19
Ein Beitrag Zur Asymptotischen Analyse Der Hydraulischen Ventilsteuerungen written by Schröders, Simon and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-19 with Technology & Engineering categories.
Für die dynamische Analyse hydraulischer Ventile wird ein Verfahren basierend auf der singulären Störungsrechnung und dem Mittelwertbildungsverfahren entwickelt. Es erfolgt die Berechnung periodischer Lösungen sowie die Analyse der Stabilität unter dem Einfluss nicht-glatter Phänomene. Basierend auf dieser Analyse werden reduzierte Modelle entwickelt, mit denen eine teils signifikante Rechenzeitersparnis in der Simulation instationärer Bewegungen und in der nichtlinearen Regelung erzielt wird. - A method based on the singular perturbation theory and the averaging method is developed for the dynamic analysis of hydraulic valves. Periodic solutions are calculated and stability is analyzed under the influence of non-smooth phenomena. Based on this analysis, reduced models are developed, which exhibit significantly improved computational time efficiency, both in the simulation of non-stationary motions as well as in nonlinear valve control.
Zur Beeinflussung Reibungsbehafteter Systeme Mithilfe Ueberlagerter Schwingungen
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Author : Kapelke, Simon
language : de
Publisher: KIT Scientific Publishing
Release Date : 2019-08-22
Zur Beeinflussung Reibungsbehafteter Systeme Mithilfe Ueberlagerter Schwingungen written by Kapelke, Simon and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-22 with Technology & Engineering categories.
Ueber Den Einfluss Der Fussgeometrie Auf Die Energieeffizienz Beim Zweibeinigen Gehen
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Author : Roemer, Ulrich Johannes
language : de
Publisher: KIT Scientific Publishing
Release Date : 2019-03-14
Ueber Den Einfluss Der Fussgeometrie Auf Die Energieeffizienz Beim Zweibeinigen Gehen written by Roemer, Ulrich Johannes and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-14 with Technology (General) categories.
The influence of foot geometry on energy efficiency in bipedal walking is investigated. A method for the optimization of the foot geometry of a bipedal robot is developed. It is based on a planar model with arbitrary convex foot geometry in combination with a hybrid zero dynamics based controller. Optimal gaits and foot geometries are determined. The average energy consumption can be reduced by more than 80% compared to a model with point feet.
On The Use Of Model Order Reduction Techniques For The Elastohydrodynamic Contact Problem
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Author : Daniel Maier
language : en
Publisher:
Release Date : 2015
On The Use Of Model Order Reduction Techniques For The Elastohydrodynamic Contact Problem written by Daniel Maier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
In today's product development process, fast and exact simulational models of complex physical problems gain in significance. The same holds for the elastohydrodynamic (EHD) contact problem. Thus, the objective of this work is to generate a compact model for the EHD contact problem by the application of model order reduction. Thereto, the EHD contact problem, consisting of the nonlinear Reynolds equation, the linear elasticity equation and the load balance, is solved as a monolithic system of equations using Newton's method. The reduction takes place by projection onto a low-dimensional subspace, which is based on solutions of the full system. Moreover, a so-called system approximation is executed at which the reduced system matrices are substituted by less complex surrogates. For the stationary EHD contact problem, an algorithm for the automated generation of the compact model is presented. This algorithm provides fast and numerically stable reduced systems on a given parameter range. Additionally, the reduced Newton method is extended to the consideration of Non-Newtonian fluids whereat highly accurate results are obtained requiring a very low computational time. Furthermore, a new formulation for the transient EHD contact problem is introduced, at which the computational area is adapted to the current contact size. This kind of morphing enables efficient reduced models in particular for excitations of large amplitude. Beside of the reduced Newton-method with system approximation, the method Trajectory Piecewise Linear (TPWL) is applied to the transient EHD contact problem. Here, further speed-up potential arises. Despite a distinctly lower computational time, the reduced model is in very good accordance with the full system.